R2 = (192 x Vout) - 240, where R2 in ohms, Vout is in volts and must be at between 1.2 V and 35 V. Vin should be at least 2.5V greater than Vout. Select a wall adapter with a voltage at least 2.5 V greater than your regulated output at full load. Maximum output [...]

Output voltage is set by two resistors R1 and R2 connected as shown below. The voltage across R1 is a constant 1.25 volts and the adjustment terminal current is less than 100uA. The output voltage can be closely approximated from Vout=1.25 * (1+(R2/R1)) which ignores the adjustment terminal current but will be close if the [...]

This is Variable Voltage Regulator 0-28V Size at 20A high current. By use IC LM317 be the control part Volt with VR1. The transistor 2N3055 x 5 amounts are wasp parallel. For help have current tall go up be 20A originally from at IC LM317 can give current get 1.5Amax only [...]